> how you’re likely to characterize your new job in the future. If you talk poorly or complain, it sends a red flag that you are unprofessional and lack company loyalty.

If a company expects me to lie in the future about my potential bad experience, it would not be a company I would work for. Sure, just "bitching" and whinery complaining ... no, nobody likes that and people who do that. But why should a company get my loyality, if they are indeed bad?