There is nothing wrong whatsoever with being judicious. You have limited time to play, and you are allowed to make value judgements. So long as you know that said judgements are subjective, there is nothing wrong with them. You do not have to see why Bob likes X to accept that he does.
Power gamer is a pejorative term for optimizer. The two have the same relationship as prima donna and roleplayer. If you only ever use the pejorative to refer to a group, you're not just judgmental, you're prejudiced.
Nonsense.
If I use pokemount to describe a paladin's mount in 3e, it hardly means that I am prejudiced either against the 3e paladin's mount or those who enjoy them.
In the first case, I have pre-judged nothing; I have made a judgement based on observation.
In the second case, I am well aware that valuation is (or largely is; that's a philosophical point) subjective.
You are prejudiced if you pre-judge individuals based upon perceived characteristics of a group, or a group based upon characteristics that you believe they have, but have not actually perceived.
Being prejudiced requires that judgement is applied without knowledge. I.e., judgement prior to knowledge, or pre-knowledge judgement.
It's just that the prejudiced set of the hobby say things like, "Steve? He's not a power gamer, he's a friend of mine!"
Or, maybe, Steve doesn't have the qualities associated with the term "power gamer" by the person making the statement?
See, I actually find this line of reasoning prejudiced. You are judging without (prior to) knowledge what is meant, and/or you are applying a characteristics of a perceived group to individuals/individual actions without (prior to) actual knowledge.
Okay, I'm judgemental about playstyles that will hamper my fun. It used to be about feeling superior to styles I found inferior, and has considerably softened to "I won't have fun with that style, and if I'm not having fun running I won't run."
That's perfectly healthy.....With the proviso that there might, in fact, be an example of that playstyle you might enjoy. Not that you need to seek it out, or accept any invitation willy-nilly because, heck, "you never know". You can make a highly edjucated guess!
Ex. I am straight. That doesn't mean that I fail to realize that, at some point in my life, I might meet someone who makes me reevaluate that statement. However, I'm not seeking such an individual out, nor am I accepting invitations just 'cause "hey, you never know".
What it does mean is that I can extend my understanding to others who are not straight without being uncomfortable about it, because I have no need to question some set-in-stone self identity to do so.
Likewise, I find 4e a poor game for what I want in a role-playing game, and I feel no need to seek out a 4e game that proves the exception. But, that doesn't mean that I need dislike anyone for liking 4e, or that I need to feel uncomfortable because someone demonstrates a skill challenge design I like. Or that I like the broad strokes of Gloomwrought. And I would still play in a Piratecat run 4e game, if given the chance, to see the legendary master in action.
Or in the worst case I've experienced, tells me the DM that no, his PC is not dead after all, because according to the 5-page background story he had emailed me earlier, he is cursed to be killed by a red dragon - and therefore
cannot be killed by anything else.
"Hey! Guess what! You broke the curse!"
RC