After doing a few decades of video analysis on both sides of the analysis, I've come to accept (and admittedly do it myself sometimes) some minor pushback from people who are getting ripped apart. It's human nature. It doesn't bother me as long as the person is still willing to accept the advice (criticism?) of the people doing the MA. Plus, here on epic, where you get MA from dozens of people, you need to weed through the responses to figure out what makes sense and what doesn't - but still listen to it all.
I think I know who you are talking about and won't point fingers, because it's not much push back (excuses), and I've seen some nasty push back from people getting MA from D-Teamers sitting in the same room. That's just ungrateful. I don't think the people here are being ungrateful, but maybe trying to focus on something specific or possibly doing some ego surfing (which is also okay once in a while, as long as it's not their only reason for posting video).
When someone is posting video to seek affirmation (ego surfing), but asking for MA, it makes it kind of deceptive. If they asked "what am I doing right", vs "what am I doing wrong", I think it would help.
Another thing that might help, would be to post any disclaimers in the original post asking for MA. Tell us what you are trying to do, what the conditions were, what physical limitations need to be taken into account, etc. That would be better received than getting MA responses then "defending" yourself.