On the upside even if some people honestly think that Keller is whiny and dithering I think that's more a case of the writing and direction the actress is being given - we've seen Jewel in other roles where she most definitely does not fit that perception and it's never been leveled at her before to my knowledge. Again I've seen people going out of their way that it's not the actress, because I'd say regardless of this particular character Jewel herself is pretty popular.

Has his comment section been this negative and wanky all the time, or did I just catch a bad day?

Bad day of venting. Sometimes you get that when someone raises something(whether positive, negative or inbetween) and it snowballs on that particular post and then it just moves on again.

Generalisations never ever help, but people unfortunately do tend to do it, rightly or wrongly. Hey, I wish they didn't myself. But people get passionate about something, hear their own thoughts echoed back to them in their corner of fandom, and suddenly they think that it must be what the majority of fandom thinks, whether it's actually true or not. Sometimes the provisos don't get added on like they should.

If it's knocking your squee I'd just avoid those areas and draw, as you say time taken up with more pleasant things is the better way to go. :) At the end of the day you'll have an easier time avoiding the anti-Kellers than they will have avoiding Keller on the show, so chalk it up to a win.