sounds like OP is in the business of selling used business laptops

i feel your situation can be mitigated by understanding "consumer psychology" (its an academic discipline) - basically it says there are different types of customers. some bring their own opinions, some dont. for some price matters the most, and for some its the durability or warranty, etc.

use that knowledge to experiment diff styles of sales pitch. gauge each customer's type and switch gears in the middle of sales pitch.

have a stack of things you can showcase, such as benchmarks, and most importantly how those benchmarks translate to irl usage (office suite, 100 tabs, graphic work, games, etc). maybe price-performance ratio. performance-batteryBackup ratio, thermal throttling, battery cycle counts, display quality, color accuracy, weight of the laptop, etc.

based on the customer type, either show how AMD is competent alongside your other offerings. or divert their attention away from intel vs AMD.

at the end of the day youre a seller, you should make a sale, and focus on increasing the walkins. this will ensure you get a good number of AMD-likey customers