It sounds to me that LL was reasonable. He has not kicked up a huge fuss about rent which IS going to be late and has asked a reasonable question without being rude.
Regardless of whether OP or anyone else thinks rents are too high, the OP has voluntarily entered into an agreement to consume a service which is being provided and payment on time is part of the deal. It is good that she has always paid on time. That is something to be expected not something to be congratulated on, nor something which then means it's okay to be late. Paying on time isnot doing the LL a favour, as some seem to think.
As many have said, once a tenant pays late once, it is very likely it will happen again. That's just a statistical fact, so you can see why LL is a bit short and enquiring to see if it is likely again.
Op, definitely reply. Be polite, apologise briefly and confirm that this is due to a change of job and pay date....and ensure you pay on time henceforth. Of course,nit would be good too to try to build an emergency buffer fund.
The LL will receive a little reassurance from your reply and also a sense of you being willing to engage and communicate....and that counts for a lot,nshes t enacts often go to ground and refuse to communicate or put their heads in the sand.
In the end, what has happened isn't ideal and isn't acceptable, but you have communicated in advance and now need to ensure further good communication plus paying on time every time in future and trying to set yourself up so this doesn't happen again. Tennessee do need to take the view that paying late is unacceptable not just something that happens and cannot expect LLs to be pleased or accepting of late payment. If this genuinely is a one-off, it won't be the end of the world, but taking the view that the LL should just have to bear the inconvenience and possibly costs isn't right. If I were a LL I would have a late payment clause in the contract and I think that would be entirely reasonable. As other tenants on here have said, when they face that,B they ensure they pay on time to avoid incurring it. Unfortunately, many people need that consequence to decide that they will pay on time rather than just think it's okay for the land look to get paid late.