I did, and my statement is no less correct. You asserted that a tank could resist a phaser because a mudflap could resist a phaser. This is invalidated by a mudflap failing to resist a phaser. It doesn't matter what happened on the other side of the mudflap for that implication to be false.
To put it succinctly:
1) You stated that a mudflap did resist a phaser
2) You concluded that a tank could resist because a mudflap did
3) It was shown that a mudflap could not resist a phaser
a) Thus a tank may or may not be able to resist a phaser
4) You assert that you never claimed a mudflap could resist a phaser, insisting that it is a lie
5) I show that you did in this statement: "Is a Sherman tougher than a packing crate? Or a mudflap? Yes or no?"
The above quote is a clear comparison of a tank to a mudflap with the tank being, obviously, stronger. Thus the only way for this to be a decisive argument is if it can be proven that a phaser can not penetrate a mudflap and by extension a tank.
Wow, I should probably not be typing at 1:30 am... I'll try that again.
Shell can penetrate up to 27" of armor.
Shell can penetrate at least 4 meters of rock.
So:
27" armor ≥ 4 m rock, and by extension: 1 m rock ≤ 6.75" armor.
By that logic a weapon capable of penetrating 1 m of rock may have the ability to penetrate the 3" armor of a Sherman tank; since the Sherman's armor is equivalent to 0.44 m of rock.
Incidentally, because that's a stone wall, it is difficult to judge against natural and solid rock formations as stone wall tend to use mortar and are often not entirely rock on the inside. On the other hand, the shots may or may not have been able to penetrate more material, but unless it's twice as much (8 m) it hardly matters.
And again, this doesn't matter anyway as we are discussing phasers which don't penetrate via kinetic force.
Worf said nothing to that effect. The conversation went as follows:
Picard: "There's a lava tube beyond here that runs for seventy five metres, then it connects with another chamber. We need to get through here. This tube opens up beyond this crack. We could widen the opening, then we should be able to crawl through. Mister Worf."
Worf: "A phaser set to level sixteen should suffice."
What was stated is that there is a tiny opening into a lava tube and that they can widen it with a phaser. They proceed to do so. Then the camera moves to the other side of the hole they just cut. There we can see a nice missing section leading into the described lava tube.
And at no point do I claim that they always do, but they can because of the weaponry they wield.
So? Dropping out of the academy says very little of your combat knowledge or overall skills. Example: B'Elanna Torres, a successful starship engineer and academy dropout.