It's relative.
BRK-A is down about 20% in the last two days and is at about half of its high for the year. That gets my attention
My international real estate and international stock funds are down to around one third of their value and my liquid net worth is about half what it was at the beginning of the year

At least, I made the good decisions to pay off the house and buy the X5 for cash (even if the latter is not worth much, I still got the government "cash back" for about 1/3 of its value when I bought it).
An acquaintance who I'll probably see this weekend is down about $1.8B. I'd still like to be in his position with about $300M left. That's tied to a public company in which he is the majority shareholder. I hope his company survives because it has been great for the local community.
Like mD, I find it's frustrating to see a good portion of what I've worked hard for and saved disappear. However, I know there are a lot of people far worse off than me. I remain patient