Does dealing low damage really such a bad thing that it needs to be shamed?

I'm AR 45 (as far as i remember) but my dps usually deals 20k max damage with food buffs and all. I recently just jumped into properly building my characters so I've been farming but my friends said that they'll help me first build up my characters until maybe 30k damage coz I might get bullied in lvl 90 domains if I farm on my own. Is it really that bad when your damage dealing is low?