Lol, but of course the conversation turn to subjective realities. I/
you/we/everyone gets to determine for ourselves what is or isn't art, because there is no way to measure it. Unlike, say, the distance light travels 1/299,792,458 seconds (ie how we have defined what a meter is). But then we go further down the rabbit whole and have to ask "but who defined it as such". Down and down we go until we determine the
everything is subjective
So yes, I'd say that everything can be art, subcategorizing it beyond that is largely meaningless.
But, because we all like labels, we (society) grant groups of people imaginary authority (art critics? whatever offical art-police's name is) to define it for us, so that we can all share in the collective subjective reality and pretend like its objective.
As I don't imagine we have any of those officials here, or if we did I don't imagine we would accept their false authority, we could make our own authority group on the subject however we prefer, and then go on to define art as we like - for those of us here. Though, since the topic was phrased slightly differently ("what do you think is art?"), I doubt such an outcome.
However, it will be interesting to see what others think, but I'm sticking to 'everything'

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