Does size matter?

Hello again, apologies for another short absence, during which I took a nice break from the trains, and went up a ski slope. And down again, obviously. Having returned, I am delighted to report that the badge design is ready, and will shortly be revealed. However, I now have another tricky decision. Because the badge has words on it, I wanted to make it as big as possible, as having someone peering at your chest from close range can offend. Men, that's a general rule for life really, so make a note, but in this particular situation I would prefer that my badge-wearing campaign didn't result in a spate of sexual harrassment cases, as people struggle to read the wise words printed there. But, on the other hand, if I make it too big, it's been pointed out to me that people might feel embarrassed about wearing it. So, what size is the right size for a protest badge? I'm tempted to go for the 38mm option, as that would seem to be a nice compromise between the eye-bleedingly tiny 25mm version, and the eye-poppingly large 72mm option. Let me know if you have any views. I won't be very sympathetic to anyone rejecting the badge in the future, on the basis that it is either too large or too small. To be honest, I won't be very sympathetic to anyone rejecting the badge at all, but that's my problem, and I'm working on it.