The university would have obligations under the Equality Act 2010 - it's possible the Aspergers could be considered a disability. The university wouldn't have

The university would have obligations under the Equality Act 2010 - it's possible the Aspergers could be considered a disability. The university wouldn't have an obligation to bring disciplinary proceedings against someone deemed "unpleasant" before calling them such - they would be required to follow their own internal process for raising a disciplinary case. It sounds like the threshold for a disciplinary case wasn't met in this case. In any event, these sorts of remarks are a grey area and any action to take depends entirely on the specific content of the communications. It's not nice to be called "unpleasant", but it's probably not libellous.