Obviously I would not MAKE tea or coffee in the microwave, however there's nothing wrong with a 30 second reheat if it's gone a bit tepid.
... there are one or two occasions where I've got up at 8.45 for a 9am meeting and microwaved ice cold, yesterday's coffee out of the cafetiere
which is uncivilised animal behaviour BUT sometimes the need for caffeine and lack of time overrides basic human decency.
Obviously I could get up earlier but there have to be some perks to the WFH life.