SJS, don’t be cowed. “Asei l’cha rav” is a standalone statement. The clause about defending your rav’s position to other people is oddly missing from the mishna.
Now, I would be perturbed if my rav endorsed having/watching TV (he does not), but to be perfectly honest- up until recently he railed against having/using internet. It is only recently that he (and many other mainstream rabbonim) began to see the need for it, and switched tacts to railing against unfiltered internet. The analogy here is twofold:
1) Your rav may be able to see a need for TV that other rabbonim do not
2) Your opponents here are disloyal to their respective rabbonim’s psak of TV=internet. They violate the internet part, and yet they have the gall to rail at you for the TV part.