> Dog whistle is a type of strategy of communication that sends a message that the general population will take a certain meaning from, but a certain group that is "in the know" will take away the secret, intended message.
If so, then that means they're trying to signal a hidden message. From what you've said, I'm assuming that you believe that they're trying to hide the fact that they don't like LGBT people or messages to them. I think that is malicious. I think the non-malicious perspective of what they wrote is that they like product logos being used for visual identification of the product.
Said differently: to me the dog-whistle seems to be “this annoying group that I don’t care about won’t leave me alone, they should shut up.”
I don’t think that’s outright malicious, necessarily.