Is the below message I sent sarcastic.

[njp213]

I sold an item (aution) and sent the below mesage to the buyer less than 24 hours later

Hi my current plan is to go to a drop off point on Sunday so it would be helpful if I received payment before then, Thanks

I received a reply saying comment was sarcastic

I thought I was being polite. Do you think I was being sarcastic.

[**peaseblossom**]

That's the problem with emails though, they can be misinterpreted so you have to be super polite, more than in speech.  

Probably not best idea to ask buyers to pay or tell them when to pay.   If they don't pay just start an Unpaid Item case after 2 complete days.  If still no joy close after 4 days to end transaction and get your fee back.