sassy grandpa

I have been isolating with my 95 year old grandpa for 3 weeks. We are both symptom free but he picks and chooses when to abide by social distancing. Today after making his lunch, taking away his dirty plates, putting on suncream for him etc he out of the blue says "don't talk to me you are polluting my air". He is 100% dementia free...just being a prick.