I like being called a bot. Not really obviously but it is the perfect time to start planting the seeds. Not only are you planting seeds on them, you are planting them on everyone that read the comments.
It works best I have found if you kill the left v right argument. Ask them how they know you are a bot? Ask them to search the hashtag and look at the people posting. Put it back on them and make them think without attacking them. "Why are members of our government trying to suppress information from us that those who have read it find disturbing?" "They work for us and we deserve transparency."
The last thing the world needs is more censorship. Censoring them for calling us bots is still censorship and kills any conversations. Do not silence them, educate them.