I assume that your buddy had proper training until solo.

The safety issue is real and serious, and it can be simply solved with a buddy box and some volunteer ready to take over control each time he messes up.
He seems to be overwelmed by the peer criteria of his flying.

He needs to deal with that fear that paralizes his brain when others are watching, one way or the other.
Building confidence with extra practice when the field is less busy and with the simulator is one method.
Switching to a less powerful and responsive model is other method (I suggest an electric glider).

Best luck to both of you,........and remind him that what other people think about him, is none of his bussiness!