After a while you get pigeonholed. You can hop jobs easily but it is the same shit, different name on the building. It is often easier to pivot inside a company then jump to a new company.
Next switch is likely starting a business.
37 y.o., still not tired of this!
I can see how someone could get bitter if they stayed in the same role/position most of their career, but in my experience this has tended to be people with a negative outlook/attitude/chip on shoulder in general... It really is what you make of it, people are people wherever you go, some are dicks, some are not.
Just accept the reality of the game and deal with it.
You don't need to spread your aura of doom everywhere you go.