My dear Madam,
As a gay man who has done anal hundreds of times, both as inserter and as receptor, may I give you a few words of advice?
First, my own experience. As receptor if I'm not absolutely positive my ass is scrupulously clean, both on the outside and dick length deep on the inside, I just won't let guys go there. As a result I've never had an embarrassing moment like this.
However as inserter I've had guys practically beg me to fuck them and when I did, I ended up with a shitty dick. I don't know what's with these guys. They had to have known they weren't ready. It seems as though they wanted to get their skatt (I'm using your spelling to avoid the censor) all over me.
Moving on to your situation. My guess here is that Mike was so horned up he wanted your ass regardless of the consequences. Despite your warnings it was "Full speed ahead, damn the tor****es". That's thinking with his small head instead of with his big head and we men are often guilty of that. To his credit he did not try to shame or belittle you about this, but rather he laughed it off and you hit the showers.
An underlying question here is "Is he into skatt?" Distressing as it is to think about, some people are. That's a whole different can of worms that I really don't want to open because I don't think he is. But you know him better than I, and if you have reason to believe he is, it will be up to you to re-evaluate him and your relationship.
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Despite my attempt to avoid the censors, it happened. The censored word is t-o-r-p-e-d-o-e-s.