MTT question - calling wide from the BB off of a tiny stack.

I was recently on a final table in a tournament in a local casino.
The bubble had just burst and we were 9-handed.
I had the smallest stack at the table (next smallest was more than 2x mine) and was now in the big blind.
After paying the BB ante I had 4.8bb of which I now had to pay 1bb as the BB.

A player from middle position opened to 2.1bb off of a 15bb stack.
It folded to me. I had a trashy hand.....T6o. I recently learned that the lower your stack the wider you can call in the BB.
However I don't know the limits of this.

Can I have a calling range off of such a small stack?

I decided to call and then check-folded on a QJJ flop to leave me with 1.7bb.

One of the other players, an older and much more experienced reg, couldn't believe it. He straight up told me at the table that I'd made a mistake...that I had to either fold or jam in that spot.

I didn't put forward an argument for my play as I don't like to talk theory at the poker table but my reasoning would have been:

• 1. I'm getting decent pot odds
  
• 2. I have no fold equity with a jam
  
• 3. If I check-fold I'll still have enough to pay the SB on the next hand and still have 1.2bb for another lap of the table.
  
• 4. Even if I fold this my stack still won't be large enough to give me much fold equity
  

So my question is....was this an egregious mistake?