It’s OK to tell the truth. It is OK to answer a text with an unpopular answer. It is OK to tell someone what is on your mind. It is OK to be uncomfortable doing it as well! So stop with the “I didn’t feel a romantic click” lines after texting someone for 10 seconds and just say “I don’t think we are physically compatible” or whatever the case may be. 99/100 times it will give everyone closure.
Mind you there are the crazies, but they don’t define the majority of us.
So please, just be honest. Shit I have gone on a date where I told the person when I met them in person, “I am sorry you don’t look like your photos and I feel a bit deceived, so I am going to head out, but thank you for coming to meet me regardless. Good luck!”