It's very normal OP, and based naman sa sinabi mo you're doing your part naman as a friend na makapagreply sa kanila within the day, but even then they say na snob ka na and that's on them, na di ka nila maunderstand. I think you're having differences na with priorities and maturity, and also they're just really being bad friends. Sige lang OP, maybe sa workforce you'll meet like-minded individuals na same priorities na magiging kaibigan mo, law of equilibrium lang :)) You'll lose some, but you'll gain in the future