Am I wrong for not checking his trash or is he wrong?

I clean offices Monday through Friday at a commercial building. There are two guys who rarely have trash in their offices the rest of them has trash everyday. So 2 weeks ago i asked the guys since they rarely have trash could i start taking their trash out in Sundays instead of everyday since they barely have trash. They both agreed that they were okay with me taking their trash on Fridays because they don’t have much trash through out the week.

One of the guys asked me yesterday “why don’t you check my trash throughout the week” and i told him “i asked you a few weeks ago to start taking your trash out on Fridays and you said you were fine with that” and he said “i said yeah to Fridays but that doesn’t mean you shouldn’t check my trash throughout the week you could at least check while you are up here “
Am I wrong for not checking his trash or is he wrong?
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