Do you think this was a bad decision to make?

no , its defently not a bad choice to not make friends with "bad" people . if they bring you down and they dont seem to care then unfortuently they arent good enough for you . hopefully one day they will learn what they are doing is wrong and fix it , but if not you cant waste your time trying to help them . (i think it is fine to try and help at first , but you cant do it forever) you do not deserve people who treat you wrong .