Yeah I hate those kind of people as well when they are noisy. Is that supposed to be an argument?
And I think the obvious counter is "that's whataboutism, you can care about lots of things at once" but I personally am pretty fatigued with just causes, so when I see people complaining about hobby aviation in ultralights I just see it as a distraction that pulls time, focus and attention from bigger problems.
All of this is, of course, completely subjective. But that was the intent behind the comment.