I have a macro on my alt for all Macro FC invtes.
"Thank you for your macro interest in inviting me to your FC. Here is my macro response. No. Thus ends my macro response".
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I'd believe you if it wasn't for the fact 90% of them respond with "You don't have to be such a jerk ( not the word they use but keeping in G rated ) bro" and I'm like "This is the X amount of times you have hit me in as many days with this macro and I was nice before...now I'm not. Deal with it".
The other 5% they are like "fair enough" and the last 5% it is as you say.