I do get upset about every single pot, I don't mind if they're stealing my blinds that's acceptable just do it unexploitably because I respect good blind stealing but if you do it badly I don't like you and I'm looking for any chance I can get to take your money.
Don't raise me at any time because I take personal offence to it, even if you've got aces you should 3bet/fold because even though I've got 57s my 4bet was correct so the pot should be MINE.
And whatever you do, do NOT fold to me when I've got a big hand because the whole table knows I'm a fish, I do have the nuts but my range is like 2% nuts and 98% middle pair or less so you should be value betting your rags and to fold them is at least unfair if not cheating, you're supposed to pay me off.
As for why winning/losing actually matters, I don't know. I don't think it's the dollars, I've played pots that were 2x my week's living expenses before and still think in BB, even after a big losing streak it's not "omg, I lost the farm!" it's "man... that hurt my
bankroll".
I don't think it's necessarily pride either, provided that you've been winning reasonably at your current stakes then you're nowhere near being outclassed, ever. I think I've played at one, maybe two tables where I've been outclassed since I started winning consistently. Simply because to just break even you have to significantly outplay your opponents to beat the rake, your edge is huge, losing is just rake and variance, you probably are outplaying your opponents. With that being said, I think the uncertainty of how good you actually are plays a role. Even if you're crushing for a huge winrate when you take a downswing it's only healthy to ask "was winning just luck?" "have I forgotten/changed something that made me a winner, can I get it back?"