It’s not obvious from the Tweet shown here but it started when someone commented on this morning’s Longlands byelection blog. It ended with a Labour activist thanking a Conservative Councillor for not blocking her. Decent Councillors don’t and Ahmet is certainly well into the decent camp. Presumably the Labour activist isn’t.
For the record, no one, not even intolerant Labour activists who are uncomfortable with exposure to conflicting views, are blocked from following @BonkersBexley.