I'm not 100% sure but can't you just tell your opponent something like "I play a little bit sluggish, I apologize in advance?". Seems pretty normal to me that different people have different rhythms. I've seen plenty of people who have trouble reading cards or following the game. When I play something like infernity I will come across people who are unable to follow what is completely happening. If they ask, I'll slow down. If not they see bits and usually accept the end result.
If you rarely go into time and you are already taking things into account by playing fast-paced decks then you are already compensating. I believe it's safe to tell complainers to piss off.
If you don't mind me asking: How long do you know you have this disorder? Your frustration might come from things you don't understand about it yet. I'm no expert but I have a little disorder myself and every now and then I hit a new wall related to it and have to find out what is going on.