The ops daughter should not be being bullied but the op needs to go into school and find out what is going on.
Of course she should not have to be friends with anyone she doesn't like.
And the school has a responsibility to both her and the boy to ensure both their needs are being met.
This is not, as many would like it, him versus her.
If he is consistently causing her anxiety or distress that's damaging for both of them and the school need to step up quickly.
Whatever the intension of a schools inclusion it can often have unintended consequences with a child who has SN being further isolated if challenging behaviours appear to be left unchecked/unpunished and effectively ignored.
But let us not be naive. The vast majority of scenarios involving children with SN and their peers without issues will be that the child with SN is being bullied and excluded. by secondary school it is almost inevitably so.
Whatever the boy is saying cannot be too horrendous and upsetting if the DD repeated it and laughed. Equally if my child was coming home daily with tales about what that boy had done today I would be having a word with her about how we should deal with that appropriately rather than through gossip and drama.
I rarely read anything on here where the situation is black and white. Children enjoy the drama of outrageous behaviour and excitement at school. A child at my school would be regularly and relentlessly wound up, told rude word to ask the teacher about, dared to drink ink, etc etc until she exploded in class and then everyone would gossip about what Sally had done this time.
The school need to be told about all the incidents so that both of these children get a reasonable chance at friendships, education and not to be bullied before the boys increasing role as 'the sen kid' gets firmly entrenched.