That sure sounds relatable! Gotta love the power hungry ones fresh off the street. Definitely a couple I'm tired of dealing with. Glad there's no trouble for you.
I understand this all to well also. We pull in people from the street all the time, but usually leads and supervisors are all brought up from within. Though sometimes that opportunity happens for people all to quickly. Seniority doesnt really matter.
It's amazing to see someone go from working on the line and up to a lead and their whole demeanor changes. Usually for the worst. While its understandable you'd want to be a little serious because you're moving up within the company, most of them behave In a way that's... well, just really shitty. A lot of "I know better than you" kind of attitude.
Eh, whatever.