Bashtag

The threat of a viral video or Twitter “bashtag” takedown has raised the cost of direct manipulation and greenwash.

The hashtag became a bashtag and Twitter users were instead using it to share their negative experiences of McDonalds,^([sic]) letting others know about the poor service and bad food they had experienced.

Unfortunately, while you like your product, others may feel differently. It doesn't take long for a hashtag to become a bashtag.