Many years ago I was on a team where the team lead decided to outright accuse one of the members of bikeshedding. The accusation turned their relationship toxic, so much so that the team member was switched off to another team shortly after the accusation.
Let's say you're of the opinion that, whether consciously or unconsciously, one or more team members are engaging in bikeshedding. How would you handle the situation? Are there things that can be done beforehand to help steer people away from bikeshedding?
"Oh it won't work because it will break xyz" "Okay so what does it take to fix xyz?" "maybe a day or two" "..."
"It's going to cost more to have xyz" "Oh how much more?" "$100 a month" "..."
"It should be blue instead of red" "no customers prefer purple" "alright we will defer this to product team / customer feedback"
That being said, people who bikeshed a lot are pretty terrible to work with, they are usually the ones first to tell you how hard a change is going to be and why we shouldn't do it. They would rather do nothing and stay in their comfort zone. Toxic to work with, fire if they cannot change.