Rider asking for a priced tip prior to delivering

Ordered a food at grab around 7am today and had a weird experience with a rider. My total order amount is just 200+ pesos with delivery fee included already and i paid online. After placing my order, the rider called me on the app saying he has a favor to ask and if i can give him a tip. I asked how much and he said 50 pesos because he will be coming far from the restaurant location which is 2.8km. I said just cancel and in my head why bakit niya inaccept if nalalayuan pala siya. He said he can’t cancel it on his end, i know that’s not the case and he chose to accept it seeing the location. Sabi pa nya paid na ako online paano daw yon, i said grab will refund naman so its okay. He really said he can’t cancel. I ended up agreeing to tip him, he said kahit 30, and i agreed. But i was planning to tip him 50 talaga but i want to see what he will say in person baka kasi pagsalitaan ako or rude. Only for him to end up cancelling the order after the call. Then i was assigned to a different rider.

The issue is not the money but how he approached me and provided reasons like it is my fault. Is this usual? I almost order everyday sa foodpanda and grab and ngayon ko lang to naexperience. I want to share my experience to grab bur naawa naman ako sa rider.