If you think that's true then you haven't seen many judges.
Other party: Did you read it before you signed it?
You: No
Other party: Why not
You: Nobody ever reads these things
Other party + Judge: :/
Other party: Did you read it before you signed it?
You: No
Other party: Why not
You: Nobody ever reads these things
Other party + Judge: :/
Now the onus is on the defense to show that it is not a common practice and who was responsible for that. Pretty excellent line to pursuit, hard to defend.
The onus is not on the one who says it the loudest, it's on the one who can provide proof. The defense can explain to the judge that they turn the screen to show it or whatever it's supposed to do.
There's no reason that the provider's testimony is magically preferred over the patient's, and in fact the generaly pratice is to resolve ambiguities in favor of the person who did not write the contract and is not the professional who has had plenty of pratice to know what they should be doing.
(We're talking about boilerplate forms here for doctor's visits, not like your mortgage)
When it comes to he said she said you need actual evidence. The judge generally weighs what's said between both parties equally unless there's a reason not to.