That's an opinion that is perfectly valid for an individual to have.

However, when you express this opinion in an expressly negative way, it makes it sound like you are attempting to invalidate the opinions of people who might hold contrasting beliefs. And history has shown this to be one of the top 10 causes for conflict and wars.

Perhaps you might find a more positive way to express your personal beliefs? Perhaps you could say, "I wish we lived in a world without pain or terminal illness, so nobody would have to make the choice between pointless suffering and death".

If you find some way to contribute to the conversation without calling a man dying of cancer "revolting", you would have a better chance of finding common ground and reaching consensus.

To disagree is to try to invalidate contrasting beliefs. They aren't saying "people who commit suicide are revolting", nor "I wish we never had to make tough choices that tested our moral constitution" (like you suggest). They're saying "saccharine suicide-endorsement is revolting".

There's no consensus arising from softening and "adjusting" each other's views. We're better off describing things clearly.

What is euthanasia, except killing yourself because you have no hope for your remaining life, like every other suicide? Is it justified because you had your family and your doctor agree with you?

I suspect you vastly underestimate the suffering in the last few weeks of cancer. you are literally being slowly eaten alive until there is not enough left to keep up basic bodily functions and pain medications generally stop being effective. You can be in chemical induced sleep or unimaginable pain.

Luckily, nobody cares what you think.