"Oh this person rationalized happiness out of a miserable life, instead of just being miserable. Somehow, that's bad and nobody should bother doing that" .. ?
"tedious" and "enjoyable" are not inherent properties of things or events, they're states of the observer.
Things aren't tedious, you the observer put the label 'tedious' on them and then yearn to get away from them.
Since you are actually vacuuming and not putting it off or paying someone else to do it, this is unhelpful labelling which only serves to make you less happy. You may as well consider it a new instance of vacuuming never seen before and look for the differences and seek to enjoy it, as considering it the same vacuuming event as last time copy-pasted and look for the similarities and then call them boring. If you have to pass through it either way, why pick the interpretation which makes you feel worse?
Like "you never step in the same river twice" because the water changes, and you change, you never vacuum the same room twice.
It sounds like a rationalization to me.