I think it’s in reference to how bi people are often told they are being “greedy” for wanting all/both sexes rather than just having the '“one” the speaker expects. This usually then leads to the misguided conclusion that they are promiscuous and unfaithful - https://lgbtqiacounseling.com/bisexual/bisexual-stereotypes/#Bisexuals_are_Greedy_or_Unable_to_Commit
Changing hair styles specifically for the car reminds me of some emergency responders who were talking about the horrific crash scenes where people wearing plastic hair claw clips that broke apart and become shrapnel or the clip simply lodging in the skull through blunt force contact (usually) with the headrest.