It is an expression of humility on the part of Jesus.
He didn't want to be treated different from other people, as he told us elsewhere, so as to teach his disciples an important lesson:
Matthew 20
25 But Jesus called them to him and said, “You know that the rulers of the Gentiles lord it over them, and their great ones are tyrants over them. 26 It will not be so among you; but whoever wishes to be great among you must be your servant, 27 and whoever wishes to be first among you must be your slave; 28 just as the Son of Man came not to be served but to serve, and to give his life a ransom for many.”
Luke 22
25So Jesus declared, “The kings of the Gentiles lord it over them, and those in authority over them call themselves benefactors. 26But you shall not be like them. Instead, the greatest among you should be like the youngest, and the one who leads like the one who serves. 27For who is greater, the one who reclines at the table or the one who serves? Is not the one who reclines? But I am among you as the One who serves.
In other words, he aspired to be at the service of others and not to "lord it over them" like a monarch at court. He didn't want to be revered as a great "benefactor", he simply wanted to help people without receiving anything in return.
Because he was charismatic, people flocked to him in a celebrity-worshipful manner but he disapproved. In this respect, there is an insightful episode in the Gospel of Jon where a great crowd of people try to proclaim Jesus a king:
When the people saw the sign that he had done, they said, “This is indeed the Prophet who is to come into the world!” Perceiving then that they were about to come and take him by force to make him king, Jesus withdrew again to the mountain by himself.
The example of true leadership was set by Jesus at the Last Supper when he knelt down to wash the feet of His disciples.
The persecuted, the weak, the poor, the lowly, those who are "last" in the world are the ones who are "first" to God and accordingly blessed by Him, summed up in that refrain of Jesus: "
the last shall be first and the first shall be last".
If anything, being a "winner" in this life is nothing to boast about in the Christian understanding, since the "first" in this world are the "last" in God's Kingdom.
So Jesus always refused to be among the "first", even when given many opportunities to be so by adoring crowds or devoted followers. He loved to subvert conventional notions of "righteousness" - often conflated with stringent religious observance of the law - and "impiety", such as his justly famous remark about the whores and tax-collectors reaching heaven before the religious leaders:
Matthew 21
Jesus said to them, “Truly I tell you, the tax collectors and prostitutes are entering the kingdom of God before you."
These individuals were not normally viewed as "good" by their societies at large, far from it. But Jesus associated himself with them.
Another saying to consider about subverting status, from the Gospel of Thomas:
46. Jesus said, "From Adam to John the Baptist, among those born of women, no one is so much greater than John the Baptist that his eyes should not be averted.
But I have said that whoever among you becomes a child will recognize the (Father's) kingdom and will become greater than John."
A small child is superior to even the greatest "holy man" of his day (i.e. John the Baptist). Or again:
78. Jesus said, "Why have you come out to the countryside? To see a reed shaken by the wind? And to see a person dressed in soft clothes, [like your] rulers and your powerful ones? They are dressed in soft clothes, and they cannot understand truth."
Jesus detested the pomp and vanity of temporal rule, with all of its trappings.
So to answer your question: was Jesus a good person? Of course he was but as a genuinely good person he didn't want people proclaiming him as such because he hated pomp and hero-worship of the kind an earthly king receives, when there was genuine "good work" to be done on behalf of suffering humanity.
