The word "ingratiated" means that Yegor likes to flatter people.
We can arrive at this answer because:
If we look up the word "ingratiated" in a dictionary, we can see the meaning of it, which refers to someone who likes to please people, to get their affection.
If we associate this word with a more colloquial meaning, we can see that this word refers to sycophants, who are people who like to please others, so that everyone likes them.
In this case, if this word is related to a character, like Yegor, it means that he is a sycophant and is always trying to flatter and promote happiness to people with ulterior motives.
