That’s a generalisation and it isn’t always true. I am a Guide on Newcomer on almost all my top level alts and people there are helping players constantly in a friendly and supportive way. If it can happen there (and Guides are just players after all) then it can happen anywhere.
Not all the community/playerbase is ‘hostile’. I will say what I’ve always felt - the hostile/toxic players are more obvious because they are loud. The decent players just go about the game, helping others while playing, quietly.