It depends how it's said and comes across I guess... Couple of examples may help:
1. I'm glad I managed to clear my mortgage today. I feel for those having to deal with the current crisis as it would hurt me also.
2. Mortgage free now. Sod paying a mortgage at the current rates, but then again, I borrowed sensibly and didn't over extend.
The written form can be easily interpreted differently than its intention though so I appreciate it wasn't your intention.
Stating that a mortgage of nearly £3,000 is "only 15% of nett home pay" is more likely to be interpreted in the negative, particularly in a thread where most people are really concerned about the rises and may not be able to afford to stay in their home.
I'm not saying anyone should be "ashamed" of being wealthy (especially if self made) however is there an argument about having humility when bringing it up in certain conversations? Perhaps, perhaps not.
There are plenty of people who post in this thread gloating that they are mortgage free (actually, far more people come here to gloat than offering the empathy you talk about above) - although to be clear I'm not implying you are one of those people.
This forum has a wide wide range of wealth. We don't criticize lottery winners or those who profited massively from Crypto from posting threads about their Lambos or winnings.