Long story, so skip to the TLDR if you like.
While playing on an alt last night, I recruited a new guildie-- a level 25 warrior. After joining, he asked if anyone was interested in running stocks. Myself and another guildie offered to go. I asked if he was comfortable tanking, otherwise we’d be in for a wait as it was late and finding a tank in chat would take awhile. He said that he was nervous to do it, but would try.
Given that I am the MT for my guild, I said no problem and I would be happy to walk him through it. Our other guildie was healing, so all we needed to do was find two dps. I ask in chat and immediately get two dps (shocking): a ret pally and a feral druid.
As everyone is making our way to stocks, I politely say to our pugs that our tank is new and to please be patient. The feral druid (to his credit) asks if he can swipe so he can aoe dps. I asked him not to and instead single target dps so the tank could focus on learning tanking.
Now, I made it clear that we had a new tank, and the druid could have chosen then to leave the group if he wanted a faster group-- he did not. He then goes on to say that the warrior should watch others to learn how to tank instead of trying to learn in a dungeon. I wasn’t in the best of moods, so I said if he didn’t like it, he could find a different group.
He then replied that he was glad that he wasn’t healing, then, and that his main is a healer and he dislikes healing tanks that do not know what they are doing. I am done at this point. I tell him that I have a tank and a healer (both 60s, because no life) and then I say that everyone complains about there being a lack of tanks, yet no one wants to let people learn how to tank. He then replies “watching is learning”.
And then, for the first time since the launch of Classic, I kicked someone. I said “yeah, this isn’t going to work” and then kicked him. We ultimately finished the dungeon and our new tank did just fine.
TLDR: Please stop complaining about the lack of tanks if you aren’t willing to be patient with people who are willing to learn the role. This is why many tanks (not all) will not, or at least are apprehensive to, tank pugs.