How do you guys/girls explain to potential new customers that you can perfectly work in a structured business environment and follow the rules, but also that you're assertive enough to oppose desicions being made based on bias, misunderstanding, fanboyism, or grave stupidity.

I just got informed from a freelance position that they would have hired me if it were not for my 'rebellious nature towards customers'

I don't oppose customers, i oppose stupidity unfounded.
Example from experience
> me working in a helodesk support position, all windows computer.
> new mgr comes into office, is a douche and complete mac fanboy
> wants all computers that are FINALLY working decent for some time in the entire department replaced with mac's... Back at 2010.
> whole team, even disliking microsoft themselves, are telling mgr that's a bad, dangerously dumb idea, expensive too, different OS, different software mgmt making, back then integration microsoft and apple was beyond diarhea... Several other issues the senior devs and admins pointed out

>mgr: 'but aple is soh much better, like a billion times better, hurrduurrrrr'
His decision passed somehow to the board..
> All stations from our customers get changed...we don't get a single machine to try out problems because overspending
> we are most of the time unable to help out customers because we still have pc's...
> mgr asks team why performance drops after 1 month
> we compared performance graph with his starting date of mgr, see clear drop after mgr's plan implemented...
> board stilll stands by mgr, gets praise for 'bold changes in the company', but appears to be some associate's son
> two main seniors leave after 15 years of employment, in three months, 80% of staff leaves.
> we canr fix the problems, we are not dev's , we get shit from all sides, i was still a junior in the industry so i worked as a slave inside that job.
> eventually get fired due to 'bad performance'
> mgr loses entire team... 'Hey why don't we outsource this dept to south africa, it's a lot cheaper! '

now that company is an it hellhouse where everyone get clinically depressed from sitting atbtheir station...
This is what i wish to oppose!

How to make that clear!