Yeah, for me it's on a sliding scale. It would have been NICE if Hillary Clinton could have acknowledged Trump when he arrived, as Michelle Obama did, BUT given all the garbage Trump says and does, I would honestly give him the cut direct as well. We can't all rise to the extraordinarily gracious level of Michelle Obama in that moment, and a cut direct is an acceptable, if extreme, response. It's quiet, it was really a non-event, like literally nothing happened between them (Trump and Clinton), and I think it would only be worth commentary if someone was LOOKING for a complaint to make. Otherwise they both kept their focus on the service, which is what they should have done.
I think people just get tired of trying to treat Trump with normal behavior, when he obviously doesn't try at all and seems to have no clue what normal behavior even IS. Like if there had just been some "normal" animosity during the campaign, everyone would say, "Hey, that's just business, don't take it personally, at the end of the day let's work together." But Trump upends all the normal rules. He does and says the most vile, personal, false, malicious, unnecessary things, with glee, and he never makes a sincere apology, tries to change his ways, or do anything to help someone other than himself. It's all well and good to say, "Let's rise above that behavior, let's kill 'em with kindness, let's take the high road no matter what the other person is doing," but sometimes you just get frickin' tired of doing that extra work, which has zero effect on the other person anyway, and you just want to ignore the other person, in a non-attention-getting way.