I was reading this book of the Bible just this morning, so your question was of interest to me.
St. Paul wrote this letter (First Corinthians) to his converts because he heard about some spiritual disorders and he wanted to condemn the abuses.
The way I understand this particular verse; yes it would be difficult for us in this day because we do not sacrifice food to idols as in those days.
What I get from this is if you read the entire chapter he was saying. The converts had knowledge, because of their conversion, that there were no such thing as an idol in reality as the pagans believe, however, the rest of those unconverted pagans did believe in idols. In reality there was no such a thing, therefore it matters not whether food that was offered to the idols was eaten or not, yet, if it gives scandal to another convert they should not eat it.
My take on this is, even if something we do is not really wrong, if it gives scandal to another we should not do it.
I may be entirely wrong and will yield to anyone who knows for sure what it means but that is what I get from the chapter and verse.