Ple-Sen
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If you want, you can look at it from my perspective: I voiced a thesis that was controversial for some, less so for others, and you ridiculed it, and continued to troll in all my subsequent replies. In short, you were rude to me, reducing the [immeasurably great] value of exchanging information on this issue to a clown show.
I had already forgotten about this, and now you're starting again. As if on purpose! That's why I'm saying - please, not again, please.
In this case, I personally think that if it's not rude, then it's at least impolite. Someone spends energy, considers something within their focus, in order to express themselves, and someone doesn't care. This doesn't apply to cases like "a jerk rudely posted something," but otherwise, yes. Every time, my heart ached when I saw at school or university how some nerd or geek was ignored, while all sorts of stupid people giggled among themselves or looked at each other in a group, discussing interesting topics, and he/she sat sadly in the corner, staring at the tabletop, and no one would tell him/her what page to read for homework until he/she got sick. Well, that's an extreme case, but it happens in different forms, towards different people. I'm not a big empath, but something like that offends my sense of justice.
Well, in our case, being well-acquainted members of the "community" in normal relationships, simply ignoring something directly addressed to you, even if it's a joke that you didn't appreciate, is just... well, it's just not very polite. On the contrary, the factor of familiarity should, logically, give a little more freedom in expressing your feelings, which would not be available in communicating with a random person who would simply not understand anything, but just in case, would react as he usually does on the street with thugs.
For example, how can I accept a derogatory joke, knowing that it's not malicious, or how can you - dismiss it as somewhat offensive, knowing the same.