I've been in both spots. I've had smart-mouthed senior guys tell me 'you'll do the same'. Here's News- no, I don't stoop to being a low-life. I'm now #1 at my new job. I treat everyone exactly the same- always did, always will. I've passed on bids in order for others to swing by their parents, etc...
Treat others like you want others to treat you. They may be above you at the next company...
One thing that really ticked me off was seeing a top guy come in on OT and try to bump a bottom (Thurs-Thru bid) spotter off his yard bid, because 'I'm senior'. Nope- a man on bid is top of his castle during that time period. Bottom guys don't get much; they are King of their Bid tho!