that the teacher did not know where my 5 year old child was at school pickup

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so i went to pick up my DS from school as normal. He wasn't bought out in his class queue so i asked the teacher where he was. She said "oh i don't know, i saw him going off to the toilet." She didn't even look bothered that he was not there. So i walked off toward the school, to find him coming out with another teacher (who had found him on his own wondering past her class room). She asked me why he wasn't with his class. I said i didn't know, and his teacher didn't seem to know but that she "saw him going off to the toilet". She looked quite surprised!
So I went back and told his teacher that he had been found by another teacher, and her response was "but he's supposed to be with me!" as if it was my childs fault. To which i responded "yes i know!". I was too annoyed to discuss it so I went home with my child.
DS has mild SN problems. He said he went to the loo, but came out before they had left, but couldn't get his coat on in time so the class went without him. So decided to make his way out of school on his own when he was found by the other teacher !
AIBU to be annoyed that this teacher did not seem to know or care where my child was ?

YANBU - perhaps try to have a quiet word with the teacher if possible. However for what you've already written, she doesn't seem to hold it as her problem in so much as your child's for not being with her.

YANBU because he has mild SN

If he didn't, I would say YABU because a 5yr old is perfectly capable of using the school loo and then entering the playground from the correct door.

Perhaps she was relaxed because she knows he's not going to come to any harm while in the school building maybe?

But surely the teacher had to be at the doorway seeing the class out? Is this a mainstream school? If so, then YABU as the ratio in an infant
class can be 1 adult to 30 kids, so there's no way the teacher can supervise every child at all times. Your son was safe, in a secure building, unable to get out without being spotted by a member of staff. That to me sounds as if everyone was doing their job properly. It isn't feasible, or appropriate, for individual children to be escorted to the toilet by the teacher when the rest of the class need to be taught or seen out at home time. I think you are expecting too much.

Does your son have a statement? does it cover things like toilet time & break?

Did your son ask the teacher if he could go the toilet ic so she should have known where he was.

Make an appt raise your concerns with the teacher and if you don't get the response you want speak to the Senco.