Well, i would just ignore those types of comments from them, they seem to enjoy making you riled up, and not worry about them. You know how you feel about your animals and they are just using those comment to get a reaction from you, probably for their own amusement. What they think isn't important, so I just wouldn't worry about it, and maybe steer the conversation away from your animals if they try to talk about them, since it's upsetting to you.