Well, I think its a two way road. A raid leader should point out mistakes ( not by shouting, just pointing out and proposing/ asking for soloution and expecting result) , also the members should point out if the raidleader is getting harsh.
I remember leading a raid back in the day, after a couple of nights of wiping, someone reached me and said one of the raid team members was very upset because of my harsh behavior. At that point I realised the wipes had made me so frustrated that I actually was acting harsh kinda unconsciously. Next day we killed the boss.
PS. If you feel abused in any guild, you should leave. There are a lot of easygoing raiding guilds out there. Joining one of those will help you both improve your skills and enjoy the game a lot more.