are you really flirtatious. or does it have to be someone you are interested in?

Innocent flirting I can do sometimes, even with friends. More flirtatious flirting is only with someone I'm interested in.

A guy can't be friendly? ,_,

rarely serious and not looking for anything

I am toning down on the flirting.

Both I like to flirt but I also find darn near everyone attractive

I can flirt and it can be meaningless.

I'd say both. Usually I flirt some as it's just my nature. I'm a lover, not a fighter. I'm friendly to most unless given reason not to be.

my playfulness gets confused for flirting.

Not at all. Neither I believe nor I would like to.