1. People who are just bad, but lie and use lag as an excuse 10%
2. People who don't react quickly enough, and think it must be lag when it isn't 80%
3. People who genuinely have lag 10%

Yeah numbers out my ass. While there are some that actually do have lag, they are vastly outnumbered by those that are just slow, and so as soon as anyone says "I was out of that!" I usually just assume they probably weren't. Probably not right, but just being honest, this is what I do. Sorry genuine people, too many slow people use this tired old excuse