If waiting for a few minutes is slow you could use the lightning network.Once you make more transactions you'll get used to the increased waiting times.
He needs to be oriented with other options when dealing with bitcoin.
Also, if he compares it with traditional payment system like WU, can he still say that the fee is high and tx is slow?
I guess he will change his mind if he will come to know other options such as using your own bitcoin wallet to transfer funds or utilizing the LN.
He has a lot of things to learn when it comes to crypto, so he should read the beginners section and other sections as suggested by one user here.
I've actually read quite a lot and familiar with a lot of theory, but at this point, I'm failing to see why Bitcoin should be more attractive both now and in the long run, being slower, with more expensive fees, and slow transaction rate, it can't really scale very well at this point.
What are the advantages of Bitcoin, except for hype/name recognition and current penetration?