I'm sorry for you, that you only encountered such people on your dungeon runs.

I suggest you try to join a newplayer friendly FC and or play with friends and doing content with them. The random people in the dungeons all have little time and patience it seems and also are douchebags.

But let me tell you not all are like that, there are good guys out there too, who don't spit on you only because you're new.

Just keep on fighting ! Ganbare !