No, it wasn't and no, they weren't. Scott and Inverted!Alex weren't on bad terms during Bendis' run nor were Scott and Uninverted!Alex on particularly bad terms during Rosenberg's run. Unless you're referring to the retconned context Hickman hasn't bothered showcasing yet?
1. Because Alex didn't totally have 'I am a much better love interest than my eviiiil older brother, tell me I'm the best you've ever had!' phase.
2. Logan's "rivalry" with basically any male villain ever is more homoerotic than two same-gendered individuals having intercourse.