[adamc]

Might be an age issue. When you get older, small font sizes are problematic. It's rude of sites to use them, IMO.

[tomc1985]

Personally I hate large font sizes. What do they think I am, 5?

[q-rews]

It depends on how large. 16/18px is a good default for body copy. IFTTT is just taking the piss, I visit it at 70% or less.