I work with one of those know-it-all types too. He knows everything about everything (or at least thinks he does), and has to one-up everybody. You can't tell him anything without yourself being accused of being a know-it-all. He's the type where if you said you beat off 3 gang bangers with a broom handle, he'd say he beat up 10 ninjas with a banana. He has what I like to call "a big mouth and a small mind." Best just to leave them to their own devices.
I knew a gal like that. The worst part about it, was where she worked and what she did. She was a cashier at a hardware store I worked at in high school. Loved that job, independently owned and operated by the 4th generation of the family that opened it in the early 1900's.
She drove an older Malibu, worked there for minimum wage, and was about 40 or so. No shame in any of that. However, it was who she THOUGHT she was that was the problem. You'd see her rusted old Malibu out there but she'd talk about how her and her husband are thinking about buying a BMW or a Porsche for her because she wanted the air-conditioned seats. She had a collection of Coach purses, but of course, she left those at home, because us poor rats would probably just steal it. We aren't 'high society' like her. Her sunglasses cost $300 (and looked suspiciously like the $10 ones we sold right there at the counter), and her and her husband ONLY ate at the best restaraunts and would NEVER go to a cheap place (even though I bumped into them all the time at my favorite little chinese take out place!). And of course, anything you did, she did better! When a co worker bought a new car, she spent 10 minutes talking about how she WOULD buy a new car, but hers is better than all of the new cars out there, and she'll have a new car as soon as they decide on the BMW or the Porsche (or Mercedes, occasionally). Had a compliment from a customer? "Oh yeah, they compliment me all the time". Stub your toe? She stubbed three.
Her husband was the polar opposite. Middle-management 9-5 type, nice guy. Very humble, would do anything for anyone; and absolutely did not brag about anything. He probably made good money, but I don't know if he made coach-purse, Porsche, Emeril-packed-my-lunch-for-me good. Does it matter? No, of course not. I don't begrudge people for having money, and I don't look down on those who are struggling. But the fact of the matter is, SHE was making minimum wage. So either A) She was working because he wanted her to do something herself instead of sit around and spend his money (supposedly he told someone this; but you know how that is). or B) They needed a little supplemental income; in which case, you probably shouldn't think about a new Porsche (Unless her income was going purely to that! You could probably make the payment and handle most of the upkeep on minimum wage if you had ZERO other expenses). EITHER WAY, she really wasn't in the position to be snubbing her nose at us poor high schoolers she worked with making minimum wage.
Though I think it was really, C). She went to work for more spending money because she had a lifestyle expectation that wasn't being met, and she needed more money to get there. More than anything, she wanted a status seat above everyone else.
What can ya do?