As a woman who tried to conceive for 4 years, I kind'a disagree.
Here's why:
1. You can't control what others are saying. I've been in this situation and I've said those things to others (and even to myself). Most of the times, it was when someone who I don't know that well shares something like that. For a moment, you feel stunned. You're not sure how to react. You try to be compassionate but also, you don't know this person. You say, "I'm sure it'll happen someday, somehow." Why is that such a bad thing? It wouldn't be bad if we say it about your career or business, would it? And even if someone close to you says it, maybe they're just the type of person who can't handle awkward silences and always looks for something to say.
2. I've also said to people "At least you get to sleep" because f****** hell!!! Set up an alarm for every two hours, then get up at 6. Do it for 5 years (I have two kids now). At the same time, deal with your own problems: your mom has cancer, your grandma has dementia, your husband has problems with his business. Then try to hold your sarcasm. People go through their own shit. We're allowed to say what we're gonna say (as long as it's not outright offensive) and not be judged. Here's something mean I'll say, but only because it's the truth: if you're going to be a mom, learn to deal with things you don't like and can't control. Like people talking whatever the hell they want.
3. Less stress won't make you more fertile, I agree. But stress will affect the decisions you make. I went from doctor to doctor in years. They told me different things and I drove myself crazy, trying to figure this out. I had sex every day, I was sick of it. One New Year's, my husband told me, let's just choose one doctor, the one you like the most, and stick with whatever they have to say. If it doesn't work, we'll figure it out. Just relax. Stop overthinking it.
So I did. I chose my doctor. End of January, she did a small medical procedure (which other doctors said won't work and had nothing to do with my infertility). In March, during a vacation, I got pregnant.
The lack of stress didn't get me pregnant, but it helped me make the right decisions, which helped me to get pregnant.
So, while I agree with the overall sentiment that people should be sensitive to other people's pain, and that the lack of stress alone won't help, I disagree with the "I'm offended" type of thinking which will soon keep us from ever saying hello to each other.
I hope you get it. <3