Seriously, are you?
Eating meat on Fridays during Lent when you know you should not is a serious sin, a sin which needs to be confessed before you commune on Sunday at Holy Mass, if you have any respect for Our Lord in the Holy Eucharist, and you do not wish to bring condemnation upon your soul.
Posture when receiving commune does matter. If you knew much about the Catholic Faith, you would know that outward signs and actions deeply affect inner, spiritual sensitivities. Taking Communion like you shove a bunch of graham crackers into your mouth Sunday after Sunday after Sunday will slowly erode the faith and reverence even the most watchful person has for the Holy Eucharist. Things at Mass are done differently than those things we do outside Church doors for a reason: to remind us of what we are participating in, with Whom we are approaching.
I was particularly interested in what the Archbishop said about Communion in the hand in the early Christian centuries. Now, not that even if they did take it the exact same way most people do today would that justify the weird, antiquarian mismatched practice of Communion in the hand as it is today, but…Archbishop Schneider was saying how even the early Christians would be absolutely horrified at how Communion is most often received today, given that It was placed in their hand and they took it up humbly with their mouths, unlike today where people take it from one hand, put it in another, and feed it to themselves (often while dropping it, which I actually saw JUST this last Sunday - thank goodness the girl SOMEHOW caught It before It hit the floor).